I don't think these things are built to be repairable. Pistons dry out and you can oil them, but that's a temporary fix. Princess Auto has good deals on air rifles regularly, got my grandson one.
Grizz
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"Indeed, no human being has yet lived under conditions which, considering the prevailing climates of the past, can be regarded as normal."
John E. Pfeiffer The Emergence of Man
written in 1969
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